1
general::
In trouble, as in She mailed all the checks with the wrong postage, and now she's really in the soup. [Slang; late 1800s]
American Heritage Idioms
2
general::
Phrase(s): *in the soup
Fig. in a bad situation. (*Typically: be ~; get [into] ~.) • Now I’m really in the soup. I broke Mrs. Franklin’s window. • I make a lot of mistakes. It’s easy for me to get into the soup.
McGrawhill's American Idioms And Phrasal Verbs